Ключевые слова: art, attention, background, beware, bolt, caution, current, danger, electric, electrical, electricity, energy, equipment, europe, fence, forbidden, hazard, high, icon, illustration, industrial, industry, information, message, notice, outdoors, power, railway, red, risk, safety, security, serbia, serbian, sign, signpost, structure, substation, supply, symbol, technology, text, traffic, transportation, travel, voltage, warning, watch, white, yellow,